4. Calculate the standard heat of formation of sodium oxide if the standard heat of formation of H2O(l) = - 285.8 kJ/mol and it is known that if under standard conditions water is taken in large excess, then when 10 g of metallic sodium interacts with water, 79.91 kJ is released, and when 20 g of sodium oxide interacts with water, 76.76 kJ is released.
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